src/field_10x26.h

   1 /**********************************************************************
   2  * Copyright (c) 2013, 2014 Pieter Wuille                             *
   3  * Distributed under the MIT software license, see the accompanying   *
   4  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
   5  **********************************************************************/
   6
   7 #ifndef SECP256K1_FIELD_REPR_H
   8 #define SECP256K1_FIELD_REPR_H
   9
  10 #include <stdint.h>
  11
  12 typedef struct {
  13     /* X = sum(i=0..9, elem[i]*2^26) mod n */
  14     uint32_t n[10];
  15 #ifdef VERIFY
  16     int magnitude;
  17     int normalized;
  18 #endif
  19 } secp256k1_fe;
  20
  21 /* Unpacks a constant into a overlapping multi-limbed FE element. */
  22 #define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
  23     (d0) & 0x3FFFFFFUL, \
  24     (((uint32_t)d0) >> 26) | (((uint32_t)(d1) & 0xFFFFFUL) << 6), \
  25     (((uint32_t)d1) >> 20) | (((uint32_t)(d2) & 0x3FFFUL) << 12), \
  26     (((uint32_t)d2) >> 14) | (((uint32_t)(d3) & 0xFFUL) << 18), \
  27     (((uint32_t)d3) >> 8) | (((uint32_t)(d4) & 0x3UL) << 24), \
  28     (((uint32_t)d4) >> 2) & 0x3FFFFFFUL, \
  29     (((uint32_t)d4) >> 28) | (((uint32_t)(d5) & 0x3FFFFFUL) << 4), \
  30     (((uint32_t)d5) >> 22) | (((uint32_t)(d6) & 0xFFFFUL) << 10), \
  31     (((uint32_t)d6) >> 16) | (((uint32_t)(d7) & 0x3FFUL) << 16), \
  32     (((uint32_t)d7) >> 10) \
  33 }
  34
  35 #ifdef VERIFY
  36 #define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0)), 1, 1}
  37 #else
  38 #define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
  39 #endif
  40
  41 typedef struct {
  42     uint32_t n[8];
  43 } secp256k1_fe_storage;
  44
  45 #define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}
  46 #define SECP256K1_FE_STORAGE_CONST_GET(d) d.n[7], d.n[6], d.n[5], d.n[4],d.n[3], d.n[2], d.n[1], d.n[0]
  47
  48 #endif /* SECP256K1_FIELD_REPR_H */